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Old 02-07-2011, 06:21 AM   #1
herman
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Heater not HOT, just Warm?

2007 Duratec, 101,000 miles, ATX. The heater used to blow very hot air in about two miles after startup. Now it just produces luke warm temps. I checked the coolant level and it is at the lower mark on the resovoir when the engine is cool, so it is correct according to the manual.


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Old 02-07-2011, 06:23 AM   #2
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i'm lucky if mine blows warm before i get to school (10-15min drive) the colder it is outside then longer it is going to take to blow warm. i'm actually amazed they don't put a small electric heater that will work till it can switch to the heater core.
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Old 02-07-2011, 07:20 AM   #3
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i woulld do a coolant flush
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Old 02-07-2011, 08:08 AM   #4
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Could need a coolant flush or the thermostat could need cleaning up
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Old 02-07-2011, 08:15 AM   #5
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thermostat either works or not, no need to clean it. Are you getting to running temperature? If the engine doesn't get warm enough then thats why you're not getting enough heat: it radiates all of the heat it produces. Try replacing the thermostat by one from the dealer, its about $15. I would not buy an aftermarket one, they tend to be less reliable and not designed on par with the Ford OEM one.

Try this and good luck.

PS You need to remove all the coolant before doing this. Would be a great time to flush the coolant and replace it. Remember to get the exact same thing that is in there.
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Old 02-07-2011, 08:25 AM   #6
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Ok, I can do this, I have read many different ways to flush the coolant system, what do you recomend.
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Old 02-07-2011, 08:30 AM   #7
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Yes, it is getting to its normal operating temperture, nothing else has happened, with no symptoms I am hesitant to change the thermostat but I may need a flush.
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Old 02-07-2011, 09:37 AM   #8
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Quote:
Originally Posted by herman View Post
Yes, it is getting to its normal operating temperture, nothing else has happened, with no symptoms I am hesitant to change the thermostat but I may need a flush.
First off, let's check that. The CHT is fairly accurate, but I don't know if the gauge that's in the dash is very accurate. You can use the electronic odometer to get a digital readout in C of the temperature. You'll have to cycle through about 20 of the 30 functions of the electronic odometer test mode until you come across one that reads like this: [-5 C]. The actual readout will depend on the temperature, if the engine is running, then that number should be climbing. It will climb to about 92 C, then drop down, and rise back up again. That's because of the thermostat opening at 90 C. This is normal operation, and you'll clearly be able to see the thermostat opening, cooling the engine, and then closing again. You won't be able to do this idling in the driveway while it's cold outside. I suggest doing it on the way to work.

Now, if you find that the thermostat is working correctly, but you still have no heat, then I would assume that the heater core is clogged. A complete home DIY coolant flush (I would personally not pay anyone for this) is not very easy to do while it's so cold. I'd simply flush the heater core. This will expel a good amount of coolant anyway. You'll have to remove both heater hoses from the engine, then put a garden hose in one and run it until the water runs clear out of the other hose. Now put the water hose in the other heater hose, and run it until it runs clear out of the other heater hose. This takes about 5 minutes- total. Reconnect, add the appropriate coolant to fill the radiator. Drive the vehicle around, and check the coolant level again. That should be it.
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Old 02-07-2011, 09:40 AM   #9
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OH I forgot to add, even though your vehicle's gauge is going to the middle, I think you're going to find that your actual engine temp never gets out of the 80-90 C range when you do the elect. odo trick- if it even gets that high. If the temp never gets to 90C, then that's a sign of a thermostat that is stuck open.

I have seen a few clogged heater cores, but really it's much more rare than a stuck thermostat because this particular design flows coolant through the core continuously, and that makes it rare for the core to clog up.
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Old 02-07-2011, 10:12 AM   #10
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The heat in my car wasn't blowing as hot as usual just "kinda" warm. Figuring after 200K miles with the original thermostat I thought it might be time to replace it. Swapped in a new one and the car warms up much faster and the heater blows hot now. Quick and simple thing to try at least.
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